So, that solution path did not work, and now I was without any drivers associated with any of my connected printers. I decided that I had no choice bu to rebuild the OS. I reverted back to my OS 10.5.4 Installation DVD to rebuild my system (without reformatting my HDD). When that was completed, I immediately went to the Print & Fax dialog and tried adding in each of my printers. Within a matter of seconds the LaserWriter was successfully added, then the HP Color Laserjet 2605dn, and FINALLY, the Laserjet P1606dn. So, it appeared that my upgrade to OS 10.5.8 was at the root of the problem.